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Zhou H, Zhang J, Shao Y, Wang J, Xu W, Liu Y, Yu S, Ye Q, Pang R, Wu S, Gu Q, Xue L, Zhang J, Li H, Wu Q, Ding Y. Development of a high resolution melting method based on a novel molecular target for discrimination between Bacillus cereus and Bacillus thuringiensis. Food Res Int 2022; 151:110845. [PMID: 34980383 DOI: 10.1016/j.foodres.2021.110845] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 11/03/2021] [Accepted: 11/27/2021] [Indexed: 11/04/2022]
Abstract
Delimitation within the Bacillus cereus group is confusing due to the highly similar genetic background of its constituent bacteria. This study aimed to develop a rapid and efficient method for the identification of Bacillus cereus and Bacillus thuringiensis, two closely related species within the B. cereus group. Using average nucleotide identity analysis (ANI) and ribosomal multilocus sequence typing (rMLST), the authenticity of the genomes of B. cereus and B. thuringiensis was determined. Emetic B. cereus and Bacillus bombysepticus were also included to provide novel genomic insights into the boundaries within the B. cereus group. Using pan-genome analysis, ispD, a novel core and single-copy molecular target, was identified for the differentiation between B. cereus and B. thuringiensis. Based on the single nucleotide polymorphism within ispD, a high resolution melting (HRM) method for the determination of B. cereus and B. thuringiensis was developed. This method can not only distinguish B. cereus and B. thuringiensis, but can also separate B. cereus from other foodborne pathogenic bacteria. The detection limit of this method could reach 1 pg of pure genomic DNA and 3.7 × 102 cfu/mL of pure culture. Moreover, this new method could effectively differentiate B. cereus and B. thuringiensis in spiked, mixed, and real food samples. Collectively, the established HRM method can provide a new reference paradigm for the sensitive and specific nucleic acid detection of pathogens with identical genomes.
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Affiliation(s)
- Huan Zhou
- College of Life Science and Technology, Jinan University, Guangzhou 510632, China; Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
| | - Junhui Zhang
- Department of Food Science & Technology, Institute of Food Safety & Nutrition, Jinan University, Guangzhou 510632, China; Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
| | - Yanna Shao
- College of Life Science and Technology, Jinan University, Guangzhou 510632, China; Department of Food Science & Technology, Institute of Food Safety & Nutrition, Jinan University, Guangzhou 510632, China; Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
| | - Juan Wang
- College of Food Science, South China Agricultural University, Guangzhou 510432, China
| | - Wenxing Xu
- Department of Food Science & Technology, Institute of Food Safety & Nutrition, Jinan University, Guangzhou 510632, China; Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
| | - Yang Liu
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
| | - Shubo Yu
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
| | - Qinghua Ye
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
| | - Rui Pang
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
| | - Shi Wu
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
| | - Qihui Gu
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
| | - Liang Xue
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
| | - Jumei Zhang
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
| | - Hongye Li
- College of Life Science and Technology, Jinan University, Guangzhou 510632, China
| | - Qingping Wu
- Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China
| | - Yu Ding
- College of Life Science and Technology, Jinan University, Guangzhou 510632, China; Department of Food Science & Technology, Institute of Food Safety & Nutrition, Jinan University, Guangzhou 510632, China; Guangdong Provincial Key Laboratory of Microbial Safety and Health, State Key Laboratory of Applied Microbiology Southern China, Institute of Microbiology, Guangdong Academy of Sciences, Guangzhou 510070, China.
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2
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Carvalho J, Yadav S, Garrido-Maestu A, Azinheiro S, Trujillo I, Barros-Velázquez J, Prado M. Evaluation of simple sequence repeats (SSR) and single nucleotide polymorphism (SNP)-based methods in olive varieties from the Northwest of Spain and potential for miniaturization. FOOD CHEMISTRY: MOLECULAR SCIENCES 2021; 3:100038. [PMID: 35415648 PMCID: PMC8991621 DOI: 10.1016/j.fochms.2021.100038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 07/10/2021] [Accepted: 07/31/2021] [Indexed: 11/17/2022]
Abstract
SSR- and SNP-based methods were evaluated for the identification of olive varieties. SNP identification was performed for the first time for two autochthonous varieties. The potential for future miniaturization of the genotyping methods was evaluated. Allele-specific PCR provided the best results for the tested olive varieties.
Miniaturization of DNA-based techniques can bring interesting advantages for food analysis, such as portability of complex analytical procedures. In the olive oil industry, miniaturization can be particularly interesting for authenticity and traceability applications, through in situ control of raw materials before production and/or the final products. However, variety identification is challenging, and implementation on miniaturized settings must be carefully evaluated, starting from the selected analytical approach. In this work, SSR- and SNP-based genotyping strategies were investigated for the identification and differentiation of two olive varieties from the Northwest of Spain. For the selected SNPs two genotyping methods were tested: real-time allele-specific PCR and high resolution melting analysis. These methods were compared and evaluated regarding their potential for integration in a microfluidic device. Both SNP-based methods proved to be successful for identification of the selected varieties, however real-time allele-specific PCR was the one that achieved the best results when analyzing mixtures, allowing the identification of both monovarietal samples and mixtures of the varieties tested with up to 25%.
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3
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Lin X, Nagl S. A microfluidic chip for rapid analysis of DNA melting curves for BRCA2 mutation screening. LAB ON A CHIP 2020; 20:3824-3831. [PMID: 32926049 DOI: 10.1039/d0lc00624f] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A microfluidic chip integrated with a microheater and a luminescent temperature sensor for rapid, spatial melting curve analysis was developed and applied for the screening of a breast cancer gene fragment. The method could detect genetic differences in around 3 minutes total for the whole procedure, which is much faster than established procedures. A microfabrication technique was developed to allow for bonding of a temperature sensing thin film and a Pt microheater with PDMS and the chips could be employed to generate and measure thermal gradients and the fluorescence intensity of stained DNA through multispectral optical imaging. The sensing layer consisting of poly(styrene-co-acrylonitrile) and a tris(1,10-phenanthroline)ruthenium(ii) temperature probe was generated by blade coating on a glass substrate with an attached Pt microheater. Calibration of the temperature between 20 and 90 °C yielded an overall resolution of around 0.13 K. The chip was employed for the screening of the BRCA 2 breast cancer gene; BRCA2 exon 5 was differentiated by its mutant rs80359463 by a 1.1 K difference in melting temperature and two fragments of BRCA2 exon 11 were differentiated by their mutants rs276174826 and rs876660311 by 0.7 K and 2.0 K, respectively. The standard deviations were between 0.1 and 0.5 K. Capable of detecting fluorescence in the DNA and temperature simultaneously and being imaged in a customized assembly, this microchip can be used to screen for mutations in a variety of DNA samples in disease diagnosis and prognosis.
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Affiliation(s)
- Xuyan Lin
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China.
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4
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Biocomputing label-free security system based on homogenous ligation chain reaction-induced dramatic change in melting temperature for screening single nucleotide polymorphisms. Talanta 2020; 218:121141. [PMID: 32797898 DOI: 10.1016/j.talanta.2020.121141] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 05/03/2020] [Accepted: 05/07/2020] [Indexed: 12/17/2022]
Abstract
The development of smart platform with accurate, inexpensive and reliable detection of single-nucleotide polymorphisms (SNPs) has long been concerned in the fields of medical diagnosis and basic research. Here, we present a ligation chain reaction (LCR)-based sensing system for the cost-effective screening of SNPs by simply conducting DNA melting analysis. No chemical modification is required and the signaling operation is accomplished in homogeneous solution, circumventing the complex modification process and possibly compromised enzymatic activity associated with heterogeneous materials, such as quantum dot (QD) and gold nanoparticle (GNP). Due to the enzymatic catalysis and high fidelity of ligase, the system is capable of executing signal amplification, providing a high sensitivity and selectivity. KRAS gene is easily recognized and the site-specific mutation of guanine (G) to adenine (A), thymine (T) or cytosine (C) is accurately screened. Moreover, the excellent reliability was demonstrated by blind test and recovery test. LCR-based signaling mechanism was further used to develop the biocomputing security system, and two logic gates consisting of four single-stranded DNAs (ssDNAs) offer a double insurance to protect the information against illegal invasion, guaranteeing the reliability of output information. Once in the absence of one essential factor, the security system was always locked regardless of target key, serving as a novel strategy to ensure the safety of output information at molecular level. As a proof-of-concept scheme, this contribution introduces new insight into the development of DNA security systems and the exploitation of powerful signal transduction strategy suitable for rapid and convenient disease diagnosis.
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5
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Kopparthy VL, Crews ND. A versatile oscillating‐flow microfluidic PCR system utilizing a thermal gradient for nucleic acid analysis. Biotechnol Bioeng 2020; 117:1525-1532. [DOI: 10.1002/bit.27278] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 12/20/2019] [Accepted: 01/14/2020] [Indexed: 11/10/2022]
Affiliation(s)
- Varun L. Kopparthy
- Center for Biomedical Engineering and Rehabilitation Science (CBERS) Louisiana Tech University Ruston Louisiana
- Present address: Cleveland Clinic Cleveland Ohio
| | - Niel D. Crews
- Institute for Micromanufacturing (IfM) Louisiana Tech University Ruston Louisiana
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6
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Jafek AR, Harbertson S, Brady H, Samuel R, Gale BK. Instrumentation for xPCR Incorporating qPCR and HRMA. Anal Chem 2018; 90:7190-7196. [DOI: 10.1021/acs.analchem.7b05176] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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Jain P, Chakma B, Singh N, Patra S, Goswami P. Metal-DNA Interactions Improve signal in High-Resolution Melting of DNA for Species Differentiation of Plasmodium Parasite. Mol Biotechnol 2017; 59:179-191. [PMID: 28421327 DOI: 10.1007/s12033-017-0004-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The success of high-resolution melting (HRM) analysis for distinguishing similar DNAs with minor base mismatch differences is limited. Here, metal-mediated structural change in DNA has been exploited to amplify HRM signals leading to differentiation of target DNAs in an orthologous gene corresponding to four Plasmodium species. Conserved 26-mer ssDNAs from ldh gene of the four Plasmodium species were employed as targets. A capture probe (CP) that is fully complementary to the Plasmodium falciparum target (FT) and has two base mismatches each, with the targets of Plasmodium vivax (VT), Plasmodium malariae, (MT), and Plasmodium ovale (OT), was considered. The DNA duplexes were treated with metal ions for structural perturbation and analyzed by HRM. Distinct resolution of melting fluorescence signal in otherwise identical HRM profiles for each of the DNA duplexes was achieved by using Ca+2 or Mg+2 ions, where, Ca+2 conferred higher resolution. The increase in resolution for CP-FT versus CP-OT, CP-FT versus CP-VT, CP-FT versus CP-MT, CP-VT versus CP-OT, and CP-MT versus CP-OT with Ca-DNA as compared to control was 67.3-, 20.4-, 22.0-, 10.9-, and 8.3-fold, respectively. The signal resolution was the highest at pH 8. The method could detect 0.25 pmol/µl of the target DNA. Structural analysis showed that Ca+2 and Mg+2 ions perturbed the structure of DNA. This perturbation helped to improve HRM signal resolution among DNA targets corresponding to the orthologous gene of four Plasmodium species. This novel approach has potential application not only for Plasmodium species-specific diagnosis but also for differentiation of DNAs with minor sequence variation.
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Affiliation(s)
- Priyamvada Jain
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, India
| | - Babina Chakma
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, India
| | - Naveen Singh
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, India
| | - Sanjukta Patra
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, India
| | - Pranab Goswami
- Department of Biosciences and Bioengineering, Indian Institute of Technology Guwahati, Guwahati, 781039, India.
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Karouia F, Peyvan K, Pohorille A. Toward biotechnology in space: High-throughput instruments for in situ biological research beyond Earth. Biotechnol Adv 2017; 35:905-932. [PMID: 28433608 DOI: 10.1016/j.biotechadv.2017.04.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Revised: 03/27/2017] [Accepted: 04/12/2017] [Indexed: 12/18/2022]
Abstract
Space biotechnology is a nascent field aimed at applying tools of modern biology to advance our goals in space exploration. These advances rely on our ability to exploit in situ high throughput techniques for amplification and sequencing DNA, and measuring levels of RNA transcripts, proteins and metabolites in a cell. These techniques, collectively known as "omics" techniques have already revolutionized terrestrial biology. A number of on-going efforts are aimed at developing instruments to carry out "omics" research in space, in particular on board the International Space Station and small satellites. For space applications these instruments require substantial and creative reengineering that includes automation, miniaturization and ensuring that the device is resistant to conditions in space and works independently of the direction of the gravity vector. Different paths taken to meet these requirements for different "omics" instruments are the subjects of this review. The advantages and disadvantages of these instruments and technological solutions and their level of readiness for deployment in space are discussed. Considering that effects of space environments on terrestrial organisms appear to be global, it is argued that high throughput instruments are essential to advance (1) biomedical and physiological studies to control and reduce space-related stressors on living systems, (2) application of biology to life support and in situ resource utilization, (3) planetary protection, and (4) basic research about the limits on life in space. It is also argued that carrying out measurements in situ provides considerable advantages over the traditional space biology paradigm that relies on post-flight data analysis.
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Affiliation(s)
- Fathi Karouia
- University of California San Francisco, Department of Pharmaceutical Chemistry, San Francisco, CA 94158, USA; NASA Ames Research Center, Exobiology Branch, MS239-4, Moffett Field, CA 94035, USA; NASA Ames Research Center, Flight Systems Implementation Branch, Moffett Field, CA 94035, USA.
| | | | - Andrew Pohorille
- University of California San Francisco, Department of Pharmaceutical Chemistry, San Francisco, CA 94158, USA; NASA Ames Research Center, Exobiology Branch, MS239-4, Moffett Field, CA 94035, USA.
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9
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Liu FW, Ding ST, Lin EC, Lu YW, Jang JSR. Automated melting curve analysis in droplet microfluidics for single nucleotide polymorphisms (SNP) genotyping. RSC Adv 2017. [DOI: 10.1039/c6ra26484k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
An integrated microchip platform with automated analysis capability for DNA melting curves is developed for Single Nucleotide Polymorphism (SNP) genotyping applications.
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Affiliation(s)
- F.-W. Liu
- Dept. of Bio-Industrial Mechatronics Engineering
- National Taiwan University
- Taipei
- Republic of China
| | - S.-T. Ding
- Dept. of Animal Science
- National Taiwan University
- Taipei
- Republic of China
| | - E.-C. Lin
- Dept. of Animal Science
- National Taiwan University
- Taipei
- Republic of China
| | - Y.-W. Lu
- Dept. of Bio-Industrial Mechatronics Engineering
- National Taiwan University
- Taipei
- Republic of China
| | - J.-S. R. Jang
- Dept. of Computer Science and Information Engineering
- National Taiwan University
- Taipei
- Republic of China
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Simko I. High-Resolution DNA Melting Analysis in Plant Research. TRENDS IN PLANT SCIENCE 2016; 21:528-537. [PMID: 26827247 DOI: 10.1016/j.tplants.2016.01.004] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Revised: 12/05/2015] [Accepted: 01/05/2016] [Indexed: 05/22/2023]
Abstract
Genetic and genomic studies provide valuable insight into the inheritance, structure, organization, and function of genes. The knowledge gained from the analysis of plant genes is beneficial to all aspects of plant research, including crop improvement. New methods and tools are continually being developed to facilitate rapid and accurate mapping, sequencing, and analyzing of genes. Here, I review the recent progress in the application of high-resolution melting (HRM) analysis of DNA, a method that allows detecting polymorphism in double-stranded DNA by comparing profiles of melting curves. Use of HRM has expanded considerably in the past few years as the method was successfully applied for high-throughput genotyping, mapping genes, testing food products and seeds, and other areas of plant research.
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Affiliation(s)
- Ivan Simko
- United States Department of Agriculture, Agricultural Research Service, U.S. Agricultural Research Station, 1636 E. Alisal St, Salinas, CA 93905, USA.
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Ngavouka MDN, Capaldo P, Ambrosetti E, Scoles G, Casalis L, Parisse P. Mismatch detection in DNA monolayers by atomic force microscopy and electrochemical impedance spectroscopy. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2016; 7:220-227. [PMID: 26977379 PMCID: PMC4778512 DOI: 10.3762/bjnano.7.20] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/19/2015] [Accepted: 01/25/2016] [Indexed: 01/10/2023]
Abstract
Background: DNA hybridization is at the basis of most current technologies for genotyping and sequencing, due to the unique properties of DNA base-pairing that guarantee a high grade of selectivity. Nonetheless the presence of single base mismatches or not perfectly matched sequences can affect the response of the devices and the major challenge is, nowadays, to distinguish a mismatch of a single base and, at the same time, unequivocally differentiate devices read-out of fully and partially matching sequences. Results: We present here two platforms based on different sensing strategies, to detect mismatched and/or perfectly matched complementary DNA strands hybridization into ssDNA oligonucleotide monolayers. The first platform exploits atomic force microscopy-based nanolithography to create ssDNA nano-arrays on gold surfaces. AFM topography measurements then monitor the variation of height of the nanostructures upon biorecognition and then follow annealing at different temperatures. This strategy allowed us to clearly detect the presence of mismatches. The second strategy exploits the change in capacitance at the interface between an ssDNA-functionalized gold electrode and the solution due to the hybridization process in a miniaturized electrochemical cell. Through electrochemical impedance spectroscopy measurements on extended ssDNA self-assembled monolayers we followed in real-time the variation of capacitance, being able to distinguish, through the difference in hybridization kinetics, not only the presence of single, double or triple mismatches in the complementary sequence, but also the position of the mismatched base pair with respect to the electrode surface. Conclusion: We demonstrate here two platforms based on different sensing strategies as sensitive and selective tools to discriminate mismatches. Our assays are ready for parallelization and can be used in the detection and quantification of single nucleotide mismatches in microRNAs or in genomic DNA.
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Affiliation(s)
- Maryse D Nkoua Ngavouka
- Elettra-Sincrotrone Trieste S.C.p.A., s.s. 14 km 163.5 in Area Science Park, Basovizza, Trieste, Italy.,INSTM - ST Unit, s.s. 14 km 163.5 in Area Science Park, Basovizza, Trieste, Italy.,University of Trieste, Via Valerio 9, Trieste, Italy
| | - Pietro Capaldo
- Elettra-Sincrotrone Trieste S.C.p.A., s.s. 14 km 163.5 in Area Science Park, Basovizza, Trieste, Italy.,University of Trieste, Via Valerio 9, Trieste, Italy
| | - Elena Ambrosetti
- Elettra-Sincrotrone Trieste S.C.p.A., s.s. 14 km 163.5 in Area Science Park, Basovizza, Trieste, Italy.,INSTM - ST Unit, s.s. 14 km 163.5 in Area Science Park, Basovizza, Trieste, Italy.,University of Trieste, Via Valerio 9, Trieste, Italy
| | - Giacinto Scoles
- Department of Medical and Biological Sciences, University of Udine, Udine, Italy
| | - Loredana Casalis
- Elettra-Sincrotrone Trieste S.C.p.A., s.s. 14 km 163.5 in Area Science Park, Basovizza, Trieste, Italy.,INSTM - ST Unit, s.s. 14 km 163.5 in Area Science Park, Basovizza, Trieste, Italy
| | - Pietro Parisse
- Elettra-Sincrotrone Trieste S.C.p.A., s.s. 14 km 163.5 in Area Science Park, Basovizza, Trieste, Italy.,INSTM - ST Unit, s.s. 14 km 163.5 in Area Science Park, Basovizza, Trieste, Italy
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Shu B, Zhang C, Xing D. A handheld flow genetic analysis system (FGAS): towards rapid, sensitive, quantitative and multiplex molecular diagnosis at the point-of-care level. LAB ON A CHIP 2015; 15:2597-605. [PMID: 25953325 DOI: 10.1039/c5lc00139k] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
A handheld flow genetic analysis system (FGAS) is proposed for rapid, sensitive, multiplex and real-time quantification of nucleic acids at the point-of-care (POC) level. The FGAS includes a helical thermal-gradient microreactor and a microflow actuator, as well as control circuitry for temperature, fluid and power management, and smartphone fluorescence imaging. All of these features are integrated into a field-portable and easy-to-use molecular diagnostic platform powered by lithium batteries. Due to the unique design of the microreactor, not only steady temperatures for denaturation and annealing/extension but also a linear thermal gradient for spatial high-resolution melting can be achieved through simply maintaining a single heater at constant temperature. The smartphone fluorescence imaging system has a wide field of view that captures all PCR channels of the microreactor in a single snapshot without the need for any mechanical scanning. By these designs, the FGAS enables real-time monitoring of the temporal and spatial fluorescence signatures of amplicons during continuous-flow amplification. On the current FGAS, visual detection of as little as 10 copies per μL of genomic DNA of Salmonella enterica was achieved in 15 min, with real-time quantitative detection of the DNA over 6 orders of magnitude concentration from 10(6) to 10(1) copies per μL also completed in 7.5-15 min. In addition, multiple pathogenic DNA targets could be simultaneously discriminated with direct bar-chart readout or multiplex spatial melting in serial flow. We anticipate that the FGAS has great potential to become a next-generation gene analyzer for POC molecular diagnostics.
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Affiliation(s)
- Bowen Shu
- MOE Key Laboratory of Laser Life Science & Institute of Laser Life Science, College of Biophotonics, South China Normal University, Guangzhou 510631, China.
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13
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Jung YK, Kim J, Mathies RA. Microfluidic Linear Hydrogel Array for Multiplexed Single Nucleotide Polymorphism (SNP) Detection. Anal Chem 2015; 87:3165-70. [DOI: 10.1021/ac5048696] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Yun Kyung Jung
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
- School
of Natural
Science, Ulsan National Institute of Science and Technology, Ulsan 689-798, Republic of Korea
| | - Jungkyu Kim
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
- Department
of Mechanical Engineering, Texas Tech University, Lubbock, Texas 79409, United States
| | - Richard A. Mathies
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
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Gale BK, Samuel R, Jayamohan H, Sant H. Microfluidic devices for rapid and sensitive identification of organisms. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2015; 2014:774-7. [PMID: 25570073 DOI: 10.1109/embc.2014.6943705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Microfluidic devices for rapid and highly sensitive detection of living organisms were developed for two applications. First, a zebrafish embryo genotyping system was developed and shown to be able to genotype embryos in the first 48 hours of the embryos life without damaging the embryos in any apparent way. Second, a highly sensitive bacteria detection platform has been developed for the rapid detection of pathogens. The system relies on a magnetic bead extraction followed by secondary bead attachment. The secondary beads are barcoded with DNA sequences highly enriched for Gs. The guanine molecules generate an electrochemical response after they are released from the secondary beads and detected at a sensing location downstream from the beads. The amplification with the efficient washing procedures leads to a limit of detection of 3 CFU in 100 mL of water.
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Li KC, Ding ST, Lin EC, Wang LA, Lu YW. Melting analysis on microbeads in rapid temperature-gradient inside microchannels for single nucleotide polymorphisms detection. BIOMICROFLUIDICS 2014; 8:064109. [PMID: 25553186 PMCID: PMC4247367 DOI: 10.1063/1.4902907] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Accepted: 11/17/2014] [Indexed: 05/12/2023]
Abstract
A continuous-flow microchip with a temperature gradient in microchannels was utilized to demonstrate spatial melting analysis on microbeads for clinical Single Nucleotide Polymorphisms (SNPs) genotyping on animal genomic DNA. The chip had embedded heaters and thermometers, which created a rapid and yet stable temperature gradient between 60 °C and 85 °C in a short distance as the detection region. The microbeads, which served as mobile supports carrying the target DNA and fluorescent dye, were transported across the temperature gradient. As the surrounding temperature increased, the fluorescence signals of the microbeads decayed with this relationship being acquired as the melting curve. Fast DNA denaturation, as a result of the improved heat transfer and thermal stability due to scaling, was also confirmed. Further, each individual microbead could potentially bear different sequences and pass through the detection region, one by one, for a series of melting analysis, with multiplex, high-throughput capability being possible. A prototype was tested with target DNA samples in different genotypes (i.e., wild and mutant types) with a SNP location from Landrace sows. The melting temperatures were obtained and compared to the ones using a traditional tube-based approach. The results showed similar levels of SNP discrimination, validating our proposed technique for scanning homozygotes and heterozygotes to distinguish single base changes for disease research, drug development, medical diagnostics, agriculture, and animal production.
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Affiliation(s)
- Kan-Chien Li
- Department of Bio-Industrial Mechatronics Engineering, National Taiwan University , Taipei, Taiwan, Republic of China
| | - Shih-Torng Ding
- Department of Animal Science, National Taiwan University , Taipei, Taiwan, Republic of China
| | - En-Chung Lin
- Department of Animal Science, National Taiwan University , Taipei, Taiwan, Republic of China
| | - Lon Alex Wang
- Department of Electrical Engineering, National Taiwan University , Taipei, Taiwan, Republic of China
| | - Yen-Wen Lu
- Department of Bio-Industrial Mechatronics Engineering, National Taiwan University , Taipei, Taiwan, Republic of China
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Knez K, Spasic D, Janssen KPF, Lammertyn J. Emerging technologies for hybridization based single nucleotide polymorphism detection. Analyst 2014; 139:353-70. [PMID: 24298558 DOI: 10.1039/c3an01436c] [Citation(s) in RCA: 58] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Detection of single nucleotide polymorphisms (SNPs) is a crucial challenge in the development of a novel generation of diagnostic tools. Accurate detection of SNPs can prove elusive, as the impact of a single variable nucleotide on the properties of a target sequence is limited, even if this sequence consists of only a few nucleotides. New, accurate and facile strategies for the detection of point mutations are therefore absolutely necessary for the increased adoption of point-of-care molecular diagnostics. Currently, PCR and sequencing are mostly applied for diagnosing SNPs. However these methods have serious drawbacks as routine diagnostic tools because of their labour intensity and cost. Several new, more suitable methods can be applied to enable sensitive detection of mutations based on specially designed hybridization probes, mutation recognizing enzymes and thermal denaturation. Here, an overview is presented of the most recent advances in the field of fast and sensitive SNP detection assays with strong potential for integration in point-of-care tests.
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Affiliation(s)
- Karel Knez
- KU Leuven, BIOSYST-MeBioS, Willem de Croylaan 42, Leuven, Belgium.
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Knez K, Janssen KPF, Spasic D, Declerck P, Vanysacker L, Denis C, Tran DT, Lammertyn J. Spherical Nucleic Acid Enhanced FO-SPR DNA Melting for Detection of Mutations in Legionella pneumophila. Anal Chem 2013; 85:1734-42. [DOI: 10.1021/ac303008f] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Karel Knez
- BIOSYST—MeBioS, KU Leuven—University of Leuven, Willem De Croylaan
42, P.O. Box 2428, B-3001 Leuven, Belgium
| | - Kris P. F. Janssen
- BIOSYST—MeBioS, KU Leuven—University of Leuven, Willem De Croylaan
42, P.O. Box 2428, B-3001 Leuven, Belgium
| | - Dragana Spasic
- BIOSYST—MeBioS, KU Leuven—University of Leuven, Willem De Croylaan
42, P.O. Box 2428, B-3001 Leuven, Belgium
| | - Priscilla Declerck
- Laboratorium for Aquatic Ecology
en Evolutionary Biology, KU Leuven—University of Leuven, Charles Deberiotstraat 32, P.O. Box 2439,
B-3000 Leuven, Belgium
| | - Louise Vanysacker
- Centre for Surface Chemistry
and Catalysis, KU Leuven—University of Leuven, Kasteelpark Arenberg 23, P.O. Box 2461, B-3001 Heverlee, Belgium
| | - Carla Denis
- Laboratorium for Aquatic Ecology
en Evolutionary Biology, KU Leuven—University of Leuven, Charles Deberiotstraat 32, P.O. Box 2439,
B-3000 Leuven, Belgium
| | - Dinh T. Tran
- Department of Food Processing,
Faculty of Food Science and Technology, Hanoi University of Agriculture, 10000 Hanoi, Vietnam
| | - Jeroen Lammertyn
- BIOSYST—MeBioS, KU Leuven—University of Leuven, Willem De Croylaan
42, P.O. Box 2428, B-3001 Leuven, Belgium
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18
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Pjescic I, Crews N. Genotyping from saliva with a one-step microdevice. LAB ON A CHIP 2012; 12:2514-2519. [PMID: 22534758 DOI: 10.1039/c2lc00010e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This paper presents a disposable microfluidic device for on-chip lysing, PCR, and analysis in one continuous-flow process. Male-female sex determination was performed with human saliva in less than 20 min from spit to finish, and requiring only seconds of manual sample handling. This genetic analysis was based on the amplification and detection of the DYZ1 repeat region unique to the Y-chromosome. The flow-through microfluidic chip consisted of a single serpentine channel designed to guide samples through 42 heating and cooling cycles. Cycling was performed by matching the local channel geometry to a steady-state temperature gradient established across the microfluidic chip. 38 channel segments were designed for rapid low volume PCR, and four were optimized for spatial DNA melting analysis. Fluorescence detection was used to monitor the amplification and to capture the melting signature of the amplicon was performed with a basic 8-bit CCD camera. The microfluidic device itself was fabricated from microscope slides and a double-sided tape. The simplicity of the system and its robust performance combine in an elegant solution for lab-on-a-chip genetic analysis.
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Affiliation(s)
- Ilija Pjescic
- Institute for Micromanufacturing, Louisiana Tech University, USA
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Poe BL, Haverstick DM, Landers JP. Warfarin genotyping in a single PCR reaction for microchip electrophoresis. Clin Chem 2012; 58:725-31. [PMID: 22317799 DOI: 10.1373/clinchem.2011.180356] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND Warfarin is the most commonly prescribed oral anticoagulant medication but also is the second leading cause of emergency room visits for adverse drug reactions. Genetic testing for warfarin sensitivity may reduce hospitalization rates, but prospective genotyping is impeded in part by the turnaround time and costs of genotyping. Microfluidics-based assays can reduce reagent consumption and analysis time; however, no current assay has integrated multiplexed allele-specific PCR for warfarin genotyping with electrophoretic microfluidics hardware. Ideally, such an assay would use a single PCR reaction and, without further processing, a single microchip electrophoresis (ME) run to determine the 3 single-nucleotide polymorphisms (SNPs) affecting warfarin sensitivity [i.e., CYP2C9 (cytochrome P450, family 2, subfamily C, polypeptide 9) *2, CYP2C9 *3, and the VKORC1 (vitamin K epoxide reductase complex 1) A/B haplotype]. METHODS We designed and optimized primers for a fully multiplexed assay to examine 3 biallelic SNPs with the tetraprimer amplification refractory mutation system (T-ARMS). The assay was developed with conventional PCR equipment and demonstrated for microfluidic infrared-mediated PCR. Genotypes were determined by ME on the basis of the pattern of PCR products. RESULTS Thirty-five samples of human genomic DNA were analyzed with this multiplex T-ARMS assay, and 100% of the genotype determinations agreed with the results obtained by other validated methods. The sample population included several genotypes conferring warfarin sensitivity, with both homozygous and heterozygous genotypes for each SNP. Total analysis times for the PCR and ME were approximately 75 min (1-sample run) and 90 min (12-sample run). CONCLUSIONS This multiplexed T-ARMS assay coupled with microfluidics hardware constitutes a promising avenue for an inexpensive and rapid platform for warfarin genotyping.
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Affiliation(s)
- Brian L Poe
- Department of Chemistry, University of Virginia, Charlottesville, VA 22904, USA
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PješĊić I, Tranter CA, Haywood JC, Paidipalli M, Ganveer A, Haywood SE, Tham J, Crews ND. Real-time damage monitoring of irradiated DNA. Integr Biol (Camb) 2011; 3:937-47. [DOI: 10.1039/c1ib00055a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Ilija PješĊić
- Institute for Micromanufacturing, Louisiana Tech University, Ruston, Louisiana 71272
| | - Collin A. Tranter
- Institute for Micromanufacturing, Louisiana Tech University, Ruston, Louisiana 71272
| | - James C. Haywood
- Institute for Micromanufacturing, Louisiana Tech University, Ruston, Louisiana 71272
| | - Manasa Paidipalli
- Institute for Micromanufacturing, Louisiana Tech University, Ruston, Louisiana 71272
| | - Ankur Ganveer
- Biomedical Engineering Program, Louisiana Tech University, Ruston, Louisiana 71272
| | - Stratton E. Haywood
- Biomedical Engineering Program, Louisiana Tech University, Ruston, Louisiana 71272
| | - Jessica Tham
- Mechanical Engineering Program, Louisiana Tech University, Ruston, Louisiana 71272
| | - Niel D. Crews
- Institute for Micromanufacturing, Louisiana Tech University, Ruston, Louisiana 71272
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21
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Zhang H, DeConinck AJ, Slimmer SC, Doyle PS, Lewis JA, Nuzzo RG. Genotyping by alkaline dehybridization using graphically encoded particles. Chemistry 2011; 17:2867-73. [PMID: 21305624 PMCID: PMC4117403 DOI: 10.1002/chem.201002848] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Indexed: 11/07/2022]
Abstract
This work describes a nonenzymatic, isothermal genotyping method based on the kinetic differences exhibited in the dehybridization of perfectly matched (PM) and single-base mismatched (MM) DNA duplexes in an alkaline solution. Multifunctional encoded hydrogel particles incorporating allele-specific oligonucleotide (ASO) probes in two distinct regions were fabricated by using microfluidic-based stop-flow lithography. Each particle contained two distinct ASO probe sequences differing at a single base position, and thus each particle was capable of simultaneously probing two distinct target alleles. Fluorescently labeled target alleles were annealed to both probe regions of a particle, and the rate of duplex dehybridization was monitored by using fluorescence microscopy. Duplex dehybridization was achieved through an alkaline stimulus using either a pH step function or a temporal pH gradient. When a single target probe sequence was used, the rate of mismatch duplex dehybridization could be discriminated from the rate of perfect match duplex dehybridization. In a more demanding application in which two distinct probe sequences were used, we found that the rate profiles provided a means to discriminate probe dehybridizations from both of the two mismatched duplexes as well as to distinguish at high certainty the dehybridization of the two perfectly matched duplexes. These results demonstrate an ability of alkaline dehybridization to correctly discriminate the rank hierarchy of thermodynamic stability among four sets of perfect match and single-base mismatch duplexes. We further demonstrate that these rate profiles are strongly temperature dependent and illustrate how the sensitivity can be compensated beneficially by the use of an actuating gradient pH field.
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Affiliation(s)
- Huaibin Zhang
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Ave., Urbana, IL,61801 (U.S.A.), Phone: 1-217-244-0809, Fax: 1-217-244-2278,
| | - Adam J. DeConinck
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 W. Green St., Urbana, IL, 61801 (U.S.A.)
| | - Scott C. Slimmer
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 W. Green St., Urbana, IL, 61801 (U.S.A.)
| | - Patrick S. Doyle
- Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA, 02139 (U.S.A.)
| | - Jennifer A. Lewis
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 W. Green St., Urbana, IL, 61801 (U.S.A.)
| | - Ralph G. Nuzzo
- Department of Chemistry, University of Illinois at Urbana-Champaign, 600 S. Mathews Ave., Urbana, IL,61801 (U.S.A.), Phone: 1-217-244-0809, Fax: 1-217-244-2278,
- Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, 1304 W. Green St., Urbana, IL, 61801 (U.S.A.)
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22
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Wang HQ, Liu WY, Wu Z, Tang LJ, Xu XM, Yu RQ, Jiang JH. Homogeneous Label-Free Genotyping of Single Nucleotide Polymorphism Using Ligation-Mediated Strand Displacement Amplification with DNAzyme-Based Chemiluminescence Detection. Anal Chem 2011; 83:1883-9. [DOI: 10.1021/ac200138v] [Citation(s) in RCA: 114] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hong-Qi Wang
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China
| | - Wei-Yu Liu
- Department of Medical Genetics, School of Basic Medical Sciences, South Medical University, Guangzhou, 510515, P. R. China
| | - Zhan Wu
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China
| | - Li-Juan Tang
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China
| | - Xiang-Min Xu
- Department of Medical Genetics, School of Basic Medical Sciences, South Medical University, Guangzhou, 510515, P. R. China
| | - Ru-Qin Yu
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China
| | - Jian-Hui Jiang
- State Key Laboratory of Chemo/Bio-Sensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, P. R. China
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Wang H, Li J, Wang Y, Jin J, Yang R, Wang K, Tan W. Combination of DNA ligase reaction and gold nanoparticle-quenched fluorescent oligonucleotides: a simple and efficient approach for fluorescent assaying of single-nucleotide polymorphisms. Anal Chem 2011; 82:7684-90. [PMID: 20726510 DOI: 10.1021/ac101503t] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A new fluorescent sensing approach for detection of single-nucleotide polymorphisms (SNPs) is proposed based on the ligase reaction and gold nanoparticle (AuNPs)-quenched fluorescent oligonucleotides. The design exploits the strong fluorescence quenching of AuNPs for organic dyes and the difference in noncovalent interactions of the nanoparticles with single-stranded DNA (ssDNA) and double-stranded DNA (dsDNA), where ssDNA can be adsorbed onto the surface of AuNPs while dsDNA cannot be. In the assay, two half primer DNA probes, one being labeled with a dye and the other being phosphorylated, were first incubated with a target DNA template. In the presence of DNA ligase, the two captured ssDNAs are linked for the perfectly matched DNA target to form a stable duplex, but the duplex could not be formed by the single-base mismatched DNA template. After addition of AuNPs, the fluorescence of dye-tagged DNA probe will be efficiently quenched unless the perfectly matched DNA target is present. To demonstrate the feasibility of this design, the performance of SNP detection using two different DNA ligases, T4 DNA ligase and Escherichia coli DNA ligase, were investigated. In the case of T4 DNA ligase, the signal enhancement of the dye-tagged DNA for perfectly matched DNA target is 4.6-fold higher than that for the single-base mismatched DNA. While in the presence of E. coli DNA ligase, the value raises to be 30.2, suggesting excellent capability for SNP discrimination.
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Affiliation(s)
- Hao Wang
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082, China
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Shi C, Zhao C, Guo Q, Ma C. Entropy-driven molecular switch and signal amplification for homogeneous SNPs detection. Chem Commun (Camb) 2011; 47:2895-7. [DOI: 10.1039/c0cc04566g] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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25
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Montgomery JL, Sanford LN, Wittwer CT. High-resolution DNA melting analysis in clinical research and diagnostics. Expert Rev Mol Diagn 2010; 10:219-40. [PMID: 20214540 DOI: 10.1586/erm.09.84] [Citation(s) in RCA: 146] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Among nucleic acid analytical methods, high-resolution melting analysis is gaining more and more attention. High-resolution melting provides simple, homogeneous solutions for variant scanning and genotyping, addressing the needs of today's overburdened laboratories with rapid turnaround times and minimal cost. The flexibility of the technique has allowed it to be adopted by a wide range of disciplines for a variety of applications. In this review we examine the broad use of high-resolution melting analysis, including gene scanning, genotyping (including small amplicon, unlabeled probe and snapback primers), sequence matching and methylation analysis. Four major application arenas are examined to demonstrate the methods and approaches commonly used in particular fields. The appropriate usage of high-resolution melting analysis is discussed in the context of known constraints, such as sample quality and quantity, with a particular focus placed on proper experimental design in order to produce successful results.
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Affiliation(s)
- Jesse L Montgomery
- Department of Pathology, University of Utah Health Sciences Center, Salt Lake City, UT 84132, USA
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26
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Becságh P, Varga K, Szakács O, Kopper L, Orosz Z. High resolution melting curve analysis of DNA sequence alterations of various sizes. Pathol Oncol Res 2010; 16:421-6. [PMID: 20490737 DOI: 10.1007/s12253-010-9274-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2010] [Accepted: 05/03/2010] [Indexed: 10/19/2022]
Abstract
In the diagnostic workflow we need to think in algorithms, containing more assays. One of the most important task in the management of cancer patient is to detect nucleic acid sequence changes in clinical specimens. Before using the most expensive method to analyze direct our targets, a screening assay is needed to reduce the number of samples. In the detection of gene-sequence alterations classical screening methods are available, as SSCP, DGGE or TGGE, (Finke Exp Clin Endocrinol Diabetes 104:92-97, 1996; Lessa and Applebaum Mol Ecol 2:119-129, 1993) however these are very time consuming processes. At this time in the molecular lab the real-time PCR equipments are very popular and with the function of melting curve analysis it can be a very convenient, simple and cost-efficient screening method.
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Inoue A, Han A, Makino K, Hosokawa K, Maeda M. SNP genotyping of unpurified PCR products by sandwich-type affinity electrophoresis on a microchip with programmed autonomous solution filling. LAB ON A CHIP 2009; 9:3297-3302. [PMID: 19865739 DOI: 10.1039/b910946c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We demonstrate rapid single-nucleotide polymorphism (SNP) genotyping on a poly(dimethylsiloxane)-glass microchip. Sandwich-type affinity electrophoresis was employed to achieve sufficient specificity for reliable genotyping of unpurified PCR products. We tested three SNPs in different genes: CYP2D6 of artificial templates, and ALDH3A1 and CYP1A1 of human genomic samples. The target sequences were amplified by asymmetric PCR. For each SNP, we prepared a capture probe-poly(dimethylacrylamide) (CP-PDMA) conjugate and allele-specific, fluorescently-labeled detection probes (DPs). Prior to the electrophoresis, necessary solutions--the amplified sample, the CP-PDMA conjugate, the DPs, and a washer--were autonomously filled into their own regions of the microchannel in contact with each other. For precise control of this filling process, we have extended our published technique to a "programmed" version, in which additional passive stop valves synchronized the solution contacting events. Then we electrophoretically carried out a target DNA hybridization step, a DP hybridization step, and a washing step at the CP-PDMA conjugate region. This 3-step electrophoresis was completed in 2 min. The formation of the sandwich hybridization complex (CP-target-DP) was evaluated by fluorescence. Normalized fluorescence values of the different genotypes were clearly and reproducibly discriminated. The assay format presented here will be suitable for SNP genotyping at the point of care.
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Affiliation(s)
- Akira Inoue
- Bioengineering Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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Microfluidic gradient PCR (MG-PCR): a new method for microfluidic DNA amplification. Biomed Microdevices 2009; 12:1-12. [DOI: 10.1007/s10544-009-9352-2] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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